A troublesome stowaway
Humans could no longer survive on Earth. We colonized moons1 and planets, using geothermal2 energy on planets outside the Goldilocks Zone. On other planets, we learned to focus the Sun’s rays for warmth and food3.
We didn’t bring animals6. There was no guarantee they’d survive the journey.
We wish we had brought a few.
Mosquitos7 managed to get onboard our ships. The new climate and lack of natural predators caused them to grow. We tried to eradicate them, but soon they overwhelmed us.